The space ship Monotros has returned to save his home world of Volfied from alien invaders. The player must defeat a different boss and his minions in each level to rescue the planet. To achieve this, the player takes control of a ship/object that forms shapes on the screen by removing enemies.
The goal is to clear 80% or more of the screen, with each additional percent adding bonus points. The player must avoid contact with floating enemies, as they will weaken and eventually destroy the ship. Forming shapes through certain barriers can also grant power-ups, such as increased speed or a laser to shoot smaller enemies.
The game features one- and two-player modes in three difficulty levels, but does not offer passwords or saved games across its many levels on the Sega Mega Drive .